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Maths Puzzle
Numerical Ability
Roz is twice as old as Grace. In 5 years the sum of their ages will be 28. How old are they now?
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book Other Question
write a verable expression for each algebraic expression
1. c+4
2.5x
3.z2
4.a
5.6y5
6.k-3
7. 5-t
8.103
How many liters of pure alcohol must be added to a 100-liter solution that is 20 percent alcohol in order to produce a solution that is 25 percent alcohol?